SP1 is no longer the OS evolution milestone it once was.There's no need to wait for Windows 7 Service Pack 1 in order to embrace the next iteration of the Windows operating system from Microsoft. At the end of March 2009, analysis company Gartner revealed a similar conclusion, indicating that Service Pack 1 was no longer the OS evolution milestone it once was, especially when it comes down to Windows 7. Microsoft saw eye to eye with Gartner on this matter and revealed that SP1 would not be a milestone designed to mark the maturity of Windows 7 in terms of security and stability. More at; http://news.softpedia.com/news/Microsoft-Don-039-t-Wait-for-Windows-7-SP1-109718.shtml
